triangles and circles Flashcards
1
Q
Arc length (when θ is in radians)
A
Arc length = rθ
2
Q
Area of a sector (when θ is in radians)
A
Area of a sector = (1/2)r²θ
3
Q
Cosine rule
A
a² = b² + c² - 2bcCosA
4
Q
Area of Triangle ( when given angle between two sides)
A
Area = (1/2)abSinC
5
Q
Sine Rule
A
a/sinA = b/sinB = c/sinC
